Colorado police are investigating vandalism at a mosque after a person was seen on surveillance video throwing rocks and a Bible through the building's glass doors and prayer area on Sunday.

"The responding officer confirmed there was damage to the building and it had been vandalized around 4 a.m. MT," Fort Collins police spokesman Dustin Weir told CNN.

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Officials with the Islamic Center of Fort Collins said the footage shows a man throwing several large rocks and the Bible into the mosque.

The Council on American-Islamic Relations (CAIR), the nation's largest Muslim civil rights and advocacy organization, urged authorities to investigate the incident as a possible hate crime.

"Because of the use of a Bible in the vandalism, we would urge state and federal law enforcement authorities to investigate the possibility of a bias motive for this attack on a house of worship," said CAIR National Communications Director Ibrahim Hooper.

For now, police are not ruling it a hate crime.

"We will let the facts determine the course of the investigation," Weir said.

Local officials condemned the attack on Twitter.

"Unacceptable! I urge anyone who has information about this incident to come forward and help us solve this crime. @FCPolice @FCCrimeStopper," Fort Collins Chief of Police John Hutto tweeted following the incident.

Unacceptable! I urge anyone who has information about this incident to come forward and help us solve this crime. @FCPolice@FCCrimeStopper